In all events for which a time-of-flight figure is scored, one or more Timers shall be stationed in the launching area with stopwatches and may not leave the launching area in order to keep the model in sight. Meet officials will provide the same number of timers to all contestants; any additional official timers must be provided by the contestant. Optical aids, other than sunglasses or eyeglasses to correct to normal vision, may not be used by the Timers, except in FAI class events, where optionally, Timers may be equipped with binoculars.
Unless specifically allowed by the rules of that event, no timed entry may separate into two or more unattached parts, or eject its motor.
The recovery system of any duration model need not deploy fully and correctly, as long as the model descends in a safe manner and the recovery system action remains within the requirements of the particular event.
15.4 Conflict of Interest
A Timer shall not time his/her own entry.
Stopwatches used for timing shall have a resolution no coarser than 1/10 second; shall have (at the minimum) standard start, stop, and reset capabilities, and shall be capable of being restarted from a stopped state without being reset. A stopwatch with split-time (or lap accumulate) capabilities (i.e., one which continues to record time internally after being stopped; and which can display at any time, on demand, the total elapsed time since the watch was started) may be used for competition, provided that if it is used to time any entry, it shall be available for use to time any other entry in competition with it.
15.6 Timed Interval
All entries shall be timed from the instant of first motion on the launcher until the part to be scored for time of flight touches the ground, is caught in a tree, power line, or otherwise stopped, or drifts out of sight of the timer. As specified in Rule 1.1, motors, recovery system protectors, and wadding are not to be timed as portions of an entry.
The official time of flight shall be computed by averaging the elapsed times of flight recorded by each Timer, then rounding to the nearest whole number of seconds. The individual elapsed times recorded by the Timers shall not be rounded before summing. After averaging the times, fractions of a second less than 0.5 shall be rounded to the next lower second; fractions of 0.5 or above shall be rounded to the next higher second.
If the model disappears behind an obstacle to vision in such a manner as to lead the Timers to believe that it touched the ground very shortly thereafter, stopwatches shall be stopped when the model disappears; however, they may be started again if the model reappears. If the model drifts out of sight in the sky, the Timers shall stop their watches individually when they lose sight of it.
15.9 Recording Data
All data shall be recorded for all timing events and flights, including those flights that may be disqualified. This permits the timing data to be available in case the disqualification ruling is later reversed.
Unless otherwise specified by the rules of the event, the contestant must return his entry to the officials after at least one of his/her qualified flights, except as specified by Rule 10.4. Contestants failing to satisfy this requirement cannot place in an event, but shall receive flight points, except in an event where the score is the sum of several factors, in which case the flight shall be scored as having a duration of zero.
When a malfunction of a stopwatch or Timer occurs such that any elapsed time measurement is not available, the elapsed time(s) recorded by the remaining Timer(s) shall be used as the official time. When all stopwatches or Timers malfunction, the flight shall not be considered an official flight unless the flight is disqualified on other grounds. Alternately, at the option of the contestant, he/she may choose to consider the flight as an official flight with a time of zero; in which case the flight cannot place but is eligible for flight points; except in an event where the score is the sum of several factors, in which case the flight shall be scored as having a time of zero.
15.12 Multi-Round Events
Any duration event listing a multi-round maximum may be flown as a multi-round event. This must be indicated on the contest sanction. The weighting factor for the event shall be increased by 4 (four) in this case.
15.12.1 Number of Flights
Each contestant is initially allowed three official flights in a multi-round event. The Contest Director may designate that each flight must be flown in the time interval (round) designated by the Contest Director. Any model not flown in its designated round shall receive a zero score.
15.12.2 Number of Models
A contestant may enter no more than two models in a multi-round event for the purpose of making the first three rounds of flights, except as stated in Rule 11.5. One (1) additional model may be entered and flown in the event if a modeler is tied for first place at the end of the third round.
15.12.3 Maximum Time
The official duration of each flight shall be calculated as follows: if the duration achieved exceeds the maximum time limit defined for that flight, the entry shall be awarded the maximum time limit; otherwise the entry shall be awarded its achieved duration in seconds. Timers may stop timing the flight after it has achieved the maximum time.
Multi-round events shall be scored as follows: the official durations achieved by the contestant on the initial three official flights in the event shall be summed. If there is no tie for first place, then the contestant achieving the highest score is the winner. If there is a tie, contenders for first place shall be given the opportunity to make additional official flights (flyoffs) to determine the winner. The maximum time limit for a contestant’s first additional flight shall be computed by adding a one minute increment (or, at the discretion of the Contest Director, a greater increment) to the maximum time limit for the event. For each subsequent additional flight made by a contestant, one additional increment shall be added to the previous maximum time limit. Additional flights shall be held in this manner until a winner is determined. Second through fourth places shall be distributed first among the other contenders in the flyoffs, and then among any other contestants having made qualified flights, on the basis of total computed score.
The models in multi-round duration events need not be returned to the officials except as required by Rules 9.10 and 15.12.2.
15.12.6 Reduced Maximum Time
If unusual weather or field conditions are encountered, the Contest Director, with the concurrence of a majority of the contestants entered in the event, may lower the maximum time to a more reasonable value. The Contest Director must advise the Regional Contest Board that this has been done and the reasons for doing so.